Millstone-dress



'NiTnn sTATns 'PATENT ernten.

FRANKLIN BELLINGER, 0F LOCKPORT, NEW YORK.

IVIILLSTONE-DRESS.

Specicaton of Letters Patent No. 20,029, dated April 27, 1858.

'To all 'whom 'it may concern:

Be it known that I, FRANKLIN BELLIN- GER, of Lockport, in the county of Niagara and State of New York, have invented a new and Improved Millsto-ne-Dress; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a partof this specification, in which- Figure 1, is a face view of a mill sto-ne showing my invention. Fig. 2 is a vertical central section of do.

Similar letters of reference indicate corresponding parts in the two figures.

This invention consists in having a series of taper furrows cut into the stone tangentially with the eye and extending from the eye to the periphery, the furrows gradually diminishing in depth as well as in width from a circle near the eye and concentric therewith, toward the periphery as hereinafter fully shown and described, whereby a certain proportion of the area of the faces of the upper and lower stonesare made to work in contact at different points according to the speed of the runner at such points, thereby causing the stones to wear evenly and also causing the stones to perform their work with a speed commensurate with their capacity to receive the grain.

To enable those skilled in the art to fully understand and construct my invention I will proceed to describe it.

A, represents one of a pair of mill stones, the upper stone or runner.

B, is the eye of the stone and C, are the furrows. These furrows it will be seen by referring to Fig. l, are of taper form gradually diminishing in width from a circle a, which is near the eyeJ B, and concentric therewith. The furrows C, terminate in points at the periphery of the stone as plainly shown inlFig. 1. The furrows C, vary in depth from the circle a, to the periphery of the stone as plainly shown in Fig. 2, the bottoms of the furrows near the periphery o-f the stone being nearly Hush wfith its face. teween the circle a, and the eye B, is inclined toward the eye as plainly shown in Fig. 2. It will be seen by referring to Fig.

The face of the stone bel, that at the circle a, the furrows C, join each other and that they are about tangential with the eye.

Both the upper and lower stones have the same dress, with the exception that the lower stone yhas a perfectly level face, the portion corresponding to that between the circle a, and the center of the stone not being inclined as shown in the upper stone or runner A.

From the above description it will be seen that the y,stones at their periphery have the greatest bearing surface and the area of the bearing surfaces gradually diminish from the periphery to the circle a, consequently it will be seen that the area of the bearing surfaces of. the stones will be in proportion to thespeed of the runner, lfor instance, as the speed gradually diminishes from the periphery to the center so also does the bearing surfaces, and the stones therefore willl wear evenly. It will also be seen that as the bearing surfaces of the stones gradually increase from the circle ai, toward the periphery, the grinding surface stones ,are in contact at their edges or peripheries the meal will be evenly ground, .no improperly ground parts being allowed to escape. The stones therefore will grind rapidly with a speed commensurate with their capacity to receive the grain, said capacity being considerable on account of the opening at the eye or inclined surface 'between the circle a., and the eye. And

this open space between the stones near the eye permits of the grain being well ventilated or cooled and prevented fro-m heating at the points where it begins to get crushed, a contingency which tfrequently occurs, owing to the dress of the ordinary stones. The stones where this dress is used may be readily kept in repair, as less dressing than usual is'required.

I would remark that the bottoms of the furrows C, are inclined as usual, to form a cutting edge at one side, and that a greater or less number of furrows may be employed according to the size or diameter of the stones. I would also remark that oneof the lower stone furrows is indicated 1n red, in Fig. 1, showing the operation of the furrows where the stones are in contact,

le arrow 1, indicating the direction of the )tation of the runner.

Having thus described my invention what claim as new and desire to secure by Let- ;rs Patent, is#- w The furrows C, cut into the stones tanentially with the eye D, and gradually iminishing, both in depth and width, from le eye to the periphery where they terminate in points, the space between the circle 10 a, and the eye B, of the runner A, being inclined or made open Substantially as and for the purpose set forth.

FRANKLIN BELLINGER.

Witnesses v A. CLARK, LESTER Gr. LEWIS. 

